Apparatus for producing metal parts



Sept. l, 1953 H. G. KELLOGG APPARATUS FOR PRODUCING METAL PARTS original Filed July 12. 194s 13 Sheets-Sheet 1 Sept- 1, 1953A H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Original Filed July l2, 1948 13 Sheets-Sheet 2 TIE; .1?

sv 85 O@ INVENToR. Blf/0MM 6. 241066 Sept, l, 1953 H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Original Filed July l2, 1948 13 Sheets-Sheet 5 INVENToR B/o/vi/P 6. Kfz L o6@ Sept- 1, 1953 H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Original Filed July l2, 1948 13 Sheets-Sheet 4 "I-E E v pEIE- E INVENTOR.

0mm #Mul/r MW@ Sept- 1 1953 H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCTNG METAL PARTS original Filed July l2, 1948 l5 sheets-sheet 5 m. .if \1 EN m v 2 g l INVENTOR.

Wm Mawr Sept. l, 1953- H. G. KELLOGG APPARATUS FOR PRODUCING METAL PARTS 13 Sheets-Sheet 6 Original Filed July l2, 1948 wfmHmH INVENTOR.

#c1/ww 6. /ffuoaa ATTORNEY Sept. 1, 1953 H. G. KELLOGG APPARATUS PoR PRODUCING METAL" PARTS Original Filed July l2. 1948 INVENTOR.

''OVVfS lll' l ll

Sept 1, 1953 H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Original Filed July l2, 1948 15 Sheets-Sheet 8 :ELE-1U H9 H9 /HS H7 :o7 i '07 /uv VENTOR.

3G ////aM/e /ffzzasa BY @fm/@MM Sept- 1, 1953 H. G. KELLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Griginal Filed July l2, 1948 13 Sheets-Sheet 9 IN VEN TOR.

Hanf/ff? A221: 066 BY afm #MMA/Q ATTORA/YS Sept' l, 1953 H. G. KLLOGG 2,650,635

APPARATUS FOR PRODUCING METAL PARTS Original Filed July 12, 1948 15 Sheets-Sheet lO INVENTOR.

Sept. 1, 1953 H. G. KELLOGG APPARATUS FOR PRODUCING METAL PARTS 13 Sheets-Sheet 11 Original Filed July l2, 1948 :CE-...l5

INVENTOR. /foMfR 6. /f-L 06a BY www Af TOR/vifs- Sept. l, 1953 H. G. KELLOGG APPARATUS FOR PRODUCING METAL PARTS 15 Sheets-Shea?l 12 `Original Filed July 12, 1948 Lau INVENTOR.

[gf/0MM 12u 066 Sept. 1, 1953 H. G. KELLOGG APPRATUS FOR PRODUCING METAL' PARTS Original Filed July l2. 1948 15 Sheets-Sheet 13 IIE-: EE

nfs A/ wm/ron #0m/ff? 6. A2M 066 By wry f Armi/vf 5 MIv Patented Sept. 1, 1953 UNITED STATS APPARATUS FOR PRODUCING METAL PARTS HomerG. Kellogg, Highland Park, Mich.,.assgnor to'Motor Products Corporation, Detroit', Mich., a corporation loi" New York' (Cl. 15S- 21) 10 Claims.

'lil'iisr invention relates generally to apparatus: for manufacturing structural members composed ometal`v strips permanently secured together-and has.A particular referenceto improvements in apparatus for securing the strips together. This applicationis al division oftheI-Iomer G. Kellogg dependingA application Serial No. 38,277, filed Ju1y12, 1948;

Although the invention is notl limited toi the` fabricationzofstructural elementsof any particular shape or size, nevertheless, it does provide highly satisfactory equipmenty for producing structural'. elements of the type commonly re ferred to inzthetradeas metal nailing members. Thesemembers usually comprise a pair of strips -channeleslraped incross section and permanently secured together in back to back relationship Withtha base portions spa-ced laterally from one another toreceive a nail therebetween. The base O portions` are ordinarily irregular 1n cross sectional contour to impart a serpentine shapey to the spacetherebetween so that' as a nail is forced intothisspace; itl is crimped and securely held against. accidental withdrawal.

In; the interests of economy in manufacture, the strips arev preferablyl securedI together adjacent opposite longitudinal edges -thereof by pins which are-forced. through the strips and have the opposite ends peened or riveted over the adjacent strips. It has been proposedto successively accomplish the above securing function at regular spaced intervals Without interrupting advancement. ofi the strip-along a predetermined path of travel, andas a consequence, this apparatus may be'used. in conjunction with the rolling machine employedl to fashion the strips to the specified. cross. sectional contour. It has also been proposed to fashion the pinsby cutting the same from substantiallycontinuous lengths of wire stock prior to forcing the pins through the strips and peening the ends of the pins.

With the above in view, itis one of the objects of vthis invention to provide apparatus of the foregoing type equipped with mechanismv for straightening the wire stock., before the latter is fed to the cut-o die. Thus any tendency for the cutoiV die to become jammed by irregular stock is eliminated and continued reliable operation of the apparatus is assured.

Another` object of this invention is to space thev 2 ing the embossingY operation. The embossed portions cooperate to holdltlfle strips in sufficient lateral spaced` relationship throughout their length to enable driving a nail betweenzthe strips at practically any selectedpoint.

Still another object of this invention is to support the spacers onthe movable die sections so that the spacers move as a unit with the diesections. This arrangement reduces wear of the spacers toa minimum since during the interval the strips are clamped between the die sections in pressure contact with the spacers the latter are moving with the strips. Thus the only time the strips move relative to the spacers is during the open positicnsjofthe die sections when the friction is ata minimum.

A further feature of'this invention is vto provide; riveting rolls4 at opposite sides of the strips be,- yond the delivery end of the die and'to provideV means for indexingthe rolls to peen the projecting ends of the pins over the adjacent strip.

The foregoing as well as other objects Willbe made more apparent as this description proceeds,

especially when considered in connection with theA accompanying drawings, wherein:

Figure l is a fragmentary plan view of vapparatus embodying. the features ofjthis invention ;l

Figure 2 is a plan view partly in section of the die assembly embodied inr the apparatus;

Figure 3 is a sectional'view taken on the line 3;-3 of Figure l';

Figure 4 isa plan View. partly in sectionof the die assembly showing theY top die section removed forY the sake of clearness;

Figure 5 is a cross sectional view takenon the line 5 5 of'Figure 4;

Figure 6 is a sectional View taken onV thev line` Figure 'Y is a sectional view taken on the liner 'i-i of Figure 5;

Figure 8 is; aV sectional View takenon the line 3 3 of,` Figure';

Figure 9'is a sectional view taken on the line 9 8, of Figure 5;

Figure 10 is a sectional view taken on the line- Iii-iii of Figure 4;

Figure ll isanl enlarged sectional View of a part-of the die assembly and' showing-the punch for driving oneofthe pins through thestrips of the structural member;`

Figure 12'- is a fragmentary perspectivev View of a part of the die assembly;

Figure 13 is a fragmentary end elevational, ViewY of a part of the apparatus showingI the straightening mechanism for the lengths of pin stock;

Figure 14 is a sectional view taken on the line iii-Id of Figure 13;

Figure l is a sectional view taken on the line |5| 5 of Figure 3;

Figure 16 is a sectional view taken on the line i-l 6 of Figure l;

Figure 17 is a semi-diagrammatic plan View of a part of the apparatus showing the indexing mechanism for the riveting rolls;

Figure 1S is a side elevational View of the indexing mechanism shown in Figure 17;

Figure 19 is a detailed sectional view of the feeding mechanism for the pin stock;

Figures 20, 21, 22 and 23 are respectively sectional views taken on the lines 2li-2U, ZI-Zl, 22-22 and 23-23 of Figure 13;

Figure 24 is a sectional view taken on the line 2li-24 of Figure 19;

.Figures 25, 26, 27 and 28 are fragmentary sectional views of the rolls provided for peening and riveting opposite ends of the pins over adjacent surfaces of the strips; and

Figure 29 is a sectional view taken on the line 29--29 of Figure 1.

It will be understood as this description proceeds that apparatus embodying the principles of this invention may be advantageously employed to form numerous different types of composite members. However, the apparatus selected herein for the purpose of illustration is especially designed to produce a structural member or element Sil comprising elongated strips 3| and 32 arranged in juxtaposition to one another.

As shown particularly in Figures 5 and 8 of the drawings the strips are substantially channel-shaped in cross section and are positioned with the base portions thereof in back to back relationship. In the present instance the base portions of the two strips are spaced laterally from one another a distance sufcient to enable driving nails therebetween and are of an irregular cross sectional contour to provide a serpentine passage. The arrangement is such that nails driven into the passage between the strips are crimped and are retained in place.

Referring now more in detail to Figures 7 and ll, it will be noted that the base portions of the two channel-shaped strips are embossed toward one another at points spaced longitudinally of the structural element 3G adjacent opposite sides thereof. The embossed portions are indicated generally by the reference numeral 33, and act as spacers for holding the base portions of the strips in proper laterally spaced relationship. In practice the embossed portions 33 at one longitudinal side edge of the structural member 3|) are offset lengthwise of the structural member with respect to the embossed portions 33 at the opposite longitudinal side edge. In cases where the structural member is of substantial width, it may also be desired to emboss the central p0rtions of the base sections of the channel-shaped strips in the manner designated by the numeral 3d in Figure 10 of the drawings.

In any case the two channel-shaped strips are riveted together at each of the embossed portions by a pin 35 projecting through the embossed portions and having the opposite ends peened or riveted over the adjacent strips in the manner indi-cated more clearly in Figure 28 of the drawings.

The structural member described above may be manufactured in substantially continuous lengths and may also be formed with a predetermined degree of curvature depending upon the use of the structural member. In any case the two channel-shaped strips are advanced `as a unit along a predetermined path of travel during the riveting and embossing operations. Thus it is not necessary to interrupt advancement of the strips during either the embossing or riveting operations, and as a consequence, the apparatus forming the subject matter of this invention may be used in conjunction with the rolling machine employed for forming the strips to the cross sectional contour described above.

With the foregoing in view, reference is now made more in detail to the apparatus for embossing and riveting the two channel-shaped strips together. This apparatus comprises a frame structure indicated generally by the reference character 36 and is adapted to support a die assembly 31 with parts thereof positioned above and below the path of travel of the two channelshaped strips. Upon reference to Figure 29 of the drawings, it-Will be noted-that a pair of feed rolls 38 are rotatably supported on the frame 36 at the entrant end of the die assembly 31 in positions to respectively frictionally engage the base portions of the channel-shaped strips 3| and 32. The bottom feed roll is secured to a shaft 39 having the opposite ends journalled in bearings 40 on the frame 36 and having a drive gear 4| secured thereto. The tcp feed roll 38 is secured to a shaft 42 having the opposite ends `iournalled in bearings on the frame 36 and having a gear 43 secured thereto in meshing relation with the gear 4|. The arrangement is such that the feed rolls are rotated in opposite directions to advance the channel-shaped strips in the direction of the arrow 44 shown in Figure 1 of the drawings. Attention may be called to the fact that the top feed roll 38 is formed of two axially spaced sections, and that a cam 44 is secured to the shaft 42 between the feed roll sections for rotation by the shaft. This cam is shown in Figures 1 and 6 of the drawings, and is instrumental in advancing the die section 31 in the direction of movement of the channel-shaped strips during the embossing and riveting operations.

The ie assembly 31 comprises a top section 45 positioned above the structural element 39 and a bottom section 46 located below the structural element. The bottom section 4E embodies a slide 41 substantially I-shaped in plan view having heads 48 at opposite ends extending laterally beyond opposite sides of the path of travel of the strips 3|, 32 and supported for sliding movement in the direction of advancement of the strips on parts 49 of the frame, shown in Figures 6, 8 and l0 of the drawings.

The slide 41 is guided by a pair of guides 55 respectively secured to the frame parts (i9 at opposite sides of the slide and having recesses 5| formed in the inner edges for receiving the adjacent edges of the slide 41. It will be noted from Figures 3 and 10 that the width of the recesses 5| is sufficiently greater than the width of the edge portions of the slide 41 received therein to enable movement of the lower die section 41 upwardly the distance required to form the embossed portions 33 and 34 in the bottom strip 3|. Secured to the top of the slide 41 is a part 52 elongated in the direction of length of the slide and having a width predetermined to enable prouiecting the same into the channel of the bottom strip 3|. As shown in Figures 5, 7, l0 and 11, the` pari; 5 2 is formed with upwardly extending projections 53 at. opposite side edgesspaced from each other4 to fashion the embossedi portions 33 in the bottom strip 3TJ in response" toV upward movement of the bottoni` die section 415. The ter row of`bosses'315v are; formed onth'e bottom trip 3l by projections 54'v` extending upwardly from the part 52 and' shown in Figure` Tof the drawings.

inasmuch as the structuralv eiernent 3'0" is lonsitudinallycurved, it willbeunderstood" that the two die sections 55 and 46 are correspondingly curved, and" this isw also true'- of" the guides 50' so that the die assembly 3l"- is' compelled to move along the same path as the= structurall element. "The bottom die section 4St also embodies a pairy of rails 55 andA 56 securedito theslidellat oppo sides of`v` the part 52, as shown in Figures 5' 10. The rail Sitvv positionedto engage' the adjacent side ofthe-bottom strip-3 Il and' acts slice tofposition this'st-ripon the'rloweredl'esection.

The ion dielsection cliis'I adaptedL to extend info the channel ofi the' to'p strlpf3-2fandil`1as a'= plate 5l engage'aloleAl withv the base of' the* life` shown irl'I lElgfures:4

channel'nshaped' strip 321-'` llland ll the plate 5l'liasldownwardly-extendins projections 5S! registering` with the-projec-r tions 53 to form the embossed portions'33' in' the1 strip 32in-responseitodownward movementI of the die sections. Additional projections are formed ontlie plate 51 at the center thereoffor ya ai row or embossed portionsll orcthertop'strip'. Supported' onthe top of the'l plate 51'? for..- sliding movement relative theretoi is; a slidel 58i having a longitudinally extending: central'. rib l 59 proj ecting upwardly: therefrom` and'. received within a:

recess Sil formed inlf the' bottom side off a t'opL rnernber,` lil: iny tlie'-rnanner clearly. shown'fin Figure ,1.2of the drawings. Referring'nowto' Figure of the drawingsr aY portion 62: atfvthesrear end the mem'oer'projectsbeyond theadiacentl end of` the slide and is'secureditoithefplate 5l' by: spacer block o3. Alcoilspring kisisupported between the block 6,3" andathe rear:` ende of the nient il@ at the front end oi the plate-51;

not shown,

ReferringV again to. Figure l2' oil thezdrawings-r it will be notedrthat van:elongatedslot ylliisrformed in opposite side walls of the'membe1:6l= inter.-

rwiiate the ends ofV the latter for remeiv-ingfL a@ The central portion of thecross':

s piece 68. trece is secured to the `slide .58vby-'sorews'iaccessible throughan opening Hl-through'thetopwall of tire memberv Si.. The reeendsy ofxthe cross:

of the spring iii byapplyingv a` rearward thrust as; inst the camvportionsfF.ionfthe.crosspieeeil; l orrning a part. of thedieassembly- 3.."lfisapair di' crs as positioned atopposite sides. of` the element 301 Thespacersare-generally *isliaped in cross section and are respectively supported on the rails 55, 56 withithestemortier. 'E3 extending horizontally. in. an. inward direction between the cooperating die sections. will be notedY particularly from Eignre of the 4ration with the projections- 54to form the ze iil project laterally beyond oppositesides. e ineinben 6 I: andare fashionedftoformfcam As will be presently set forth the. slide 52 is moved in a directionagainst the actiondrawings that the ralsare formedwithreoesses.

ingqtlie lower. ends of'the` head portions. 'l5 of ,the spacers. The sternportions 'I3 are located to extendbetween the two strips 3l, t2 of the structural element Sil as the latter is fed between the die sections. The thickness of the stem portions 73" corresponds to the specified spacing between thevstrips 3l, 32 and are shaped to correspond to the cross sectionalcontour of the portions cf the strips engaged thereby. It will also be noted that the stem portions Stare formed with slots Tt. which extendiorwardly from the rear ends of the spacers'and provide clearance for the ernbossing projections 53 and 5.8' respectively carried by the top. and bottom die sections.. As shown particularly inlli'igure 'lof the drawings, the rear ends the heads l on the spacers are adapted tov aout shculders` il.' formed oy the rear ende of the recesses lli. The spacers are normally held against theshoulders il'. by reason oi the fric tional` engagement between the strips 3i, 32 and the stemportions. "iti of the spacers. Referring' again toFigure 5 ofthe drawings, it will 'ne noted that the head portions i5 of the spacers respectivelyV frictionaliy engage the flanges at opposite sides ofthe structural element 3e and resist any tendency for these iangesto deform during the embossing operation. The foregoing construe tion is such that when the cooperating die sections are moved into clamping engagement with 'the structural element 3i?, the spacers l2. move asa unit wir 'ie die 3l" along the pathof travel of, the stru. rai element, so that during the interval inarnncin pressure applied to the spacersthere is no relative movement between the structural element and spacers. This is high.n advantageous in that it reduces the wear of the spacers to a minimum.

In some instances it may be desirable to provide a support for the central portion of the structural element 3i? while the is located between the cooperating die sections. With this in view` reference is made to Figures 5, 7, B and l0. whereinit will' be noted that a pressure pad Si! is supported on the. lower die section in a position to,Y engage the central portion of the bottom strip 3l. The pressure pad itl in the form of, an elongated strip which entends rearwardlyfrorn the. spacers l2 to approximately the rear endlofthe die assembly. This pressure pad .supportedfor vertical sliding movement at spaced points on the part 52? of the bottom die sections le icy pins ill having the upper. ends securedto the pressure pad and having the lower ends slidable in hores 82 formed in the part 52. The pressure pad yieldahly urged at longitudinally spaced'points in an upward direction into engagement with the strip 3i by. coil springs t3 located wi'tlli'nthe recesscslli also formed in the part. o the lower die section.

Upon reference toFieures fi and 8 of the drawings. it will he noted 'that blocks lfsare respectively secnred'to the slide Il? at each of 'the corners thereofl Eaohblock. ellis bored and a pressed nt. withtlie lower end of a vertically extending .guide pin4 S5, rllhe upper ends of the guide pins project substantially alcove the die assembly Sii and a header: assembly Se is sli-:lably supported onthe guide The header assembly 86 ocinprises a. plate approximating in sire the slide il and; having blocks 8B. respectively secured to the. underside at the four corners thereof. The blocks. 8B andplate (il are formed with aligned openings ktherethrough for slidably receiving thev pins 85. As shownparticularly in Figure 2 of the drawings, a bridge 89 extends transversely of the plate 81 at each end thereof. The bridges 89 are provided with laterally inwardly extending ears Se at opposite ends and the ears are respectively slidably supported on the adjacent guide pins 85.

The header assembly 86 is normally yieldably maintained in its raised position by means of four coil springs 9| respectively located between the pads S8 on. the plate 81 and the pads 84 on the slide 41 as clearly shown in Figures 4, 6 and 9 of the drawings. It will also be noted from Figure 7 of the drawings that the plate 81 is, in effect, connected to the top die section 45 by coil springs 92 located between the top die section t adjacent opposite ends of the latter and the plate 81. The purpose of the coil springs 92 is to urge the top die section l5 downwardly in response to downward movement of the header assembly 86.

The header assembly 86 is moved downwardly to effect a corresponding movement of the top die section d5 by a pair of cams 93 respectively supported at opposite sides of the plate 81 above the latter on a drive shaft 94. As shown in Figure l of the drawings, the drive shaft 94 is journalled in bearings 95 suitably supported on the machine frame 36, and is driven in a manner to be more fully hereinafter described. Upon reference to Figure 5 of the drawings it will be noted that the plate 81 is formed with recesses in opposite sides thereof to provide clearance for the cams 33, and the latter are respectively engageable with blocks 96 secured to the plate 81 by angle members 91. The arrangement is such that rotation of the cams 93 in a clockwise direcf tion from the position thereof shown in Figure 9 of the drawings imparts a downward thrust on the blocks 9G and causes the header assembly 89 to travel downwardly. As a result the springs S32 are compressed and the upper die section t5 is moved downwardly to emboss the top channel strip 32.

The bottom die section 46 is moved upwardly at the same time that the top die section is moved downwardly, and this is accomplished by cams 9S. rEhe cams 98 are secured to a shaft 99 which extends transversely of the bottom die section 46 below the latter and is suitably journalled on the frame of the machine. It will be noted from Figure l of the drawings that the shaft 99 is ex- 3 tended for connection to a suitable source of power and is connected to the feed roll shaft 42 for operating the latter through the medium of gearing |00. The shaft 99 also has a gear |il| secured thereto, and this gear is adapted to mesh with a gear |02 secured t0 the cam shaft 94 for rotating' the latter.

The cams 9S have suitable projections for selectively engaging the undersides of the rails 55, 56 in the manner clearly shown in Figure 5 of the drawings. It will be noted that the slide 41 is in its lowerniost position in Figure 5 of the drawings, and that sufficient clearance is provided by the guides to enable the upward movement of the bottom die section 46 required for the embossing projections to cooperate with the registering embossing projections on the top die section 45 to emboss the channel strips.

In order to assure uniform movement of the two die sections toward one another, linkage |02 is supported at opposite sides of the die 31. As shown in Figures 6 and 8 of the drawings, each linkage comprises a longitudinally extending link |03 having the rear end respectively pivotally connected to the blocks 84 and 88 at the rear end of the die 31 by links |04. The front end of reach link |03 is respectively pivotally connected Ato the blocks 84 and 88 at the front end of the die by links |05. This linkage acts to prevent lcocking or tilting of the two die sections 45 and 46 as the latter are moved relative to one another.

Cooperating with the linkage |02 to assure uniform movement of the top die section 45 in a downward direction are two pairs of rollers |06 and |01. The rollers |06 are spaced laterally from each other in the manner shown in Figure 2 of the drawings and are engageable with pads |08 secured to the top of the plate 81 adjacent 'the front end of the latter. The rollers |06 are respectively rotatably supported on the lower ends of vertically extending arms |09 by shafts I0 which extend laterally outwardly beyond the .lower ends of the arms |09 through slots formed in adjacent vertically extending frame lmembers ||2. Thus the rollers |06 are guided in a vertical path by the slots in the frame members |2. The upper ends of the arms |09 are respectively pivotally connected to the front -end of a pair of rock arms I|3 shown in Figure '14 of the drawings as pivoted intermediate the ends to plates ||4 which are shown in Figure 3 as respectively secured to the top edges of the frame members ||2. It will also be noted from Figure 3 of the drawings that the frame members |2 and associated plates |4 are recessed to provide clearance for the cams 93. The rear swinging ends of the rock arms ||3 are shown in Figure 14 as connected by a bridge member 5 and it will be noted from Figure 3 of the drawings that the undersides of the rear ends of the rock arms H3 respectively engage the cams 93. The arrangement is such that when the cams 93 are rotated in a clockwise direction to move the top die section downwardly, the rock arms ||3 are swung in a corresponding direction to urge the rollers |06 in a downward direction against the pads |08 on the plate 31.

The rollers |01 respectively engage pads ||6 at the rear end of the plate 81 and are moved downwardly as a unit with the rollers |06 so that substantially uniform downward pressure is applied to opposite ends of the plate 81 to assure unlform downward movement of the top die section 45. As shown in Figure 10 of the drawings, the shafts ||1 on which the rollers |01 are mounted extend laterally outwardly and respectively project through slots ||8 formed in the vertical frame members 2, so that the rollers |91 are also guided throughout their vertical travel. The roller shafts |I1are respectively supported on the lower ends of a pair of vertical arms |19 having the upper ends respectively pivotally connected to the rear ends of a pair of rock arms |20 similar to the rock arms I3 in that they are pivoted intermediate the ends on the plates H4. The front ends of the rock arms |20 are connected by a bridge |2| and an adjustable set screw |22 is supported on the bridge |2| for contact with the bridge ||5 previously described as connecting the rear ends of the rock arms I3. The arrangement is such that the rock arms |3 operate the rock arms |20 to force the rollers |67! downwardly against the pads ||6 with approximately the same force as applied to the pads |08 by the rollers |06.

In accordance with the present invention movement of the rock arms ||3 and |20 by the cam 93 operates the rivet stock feeding mechanism designated generally by the reference character |23. As shown in `ligures 13 and 19 the feeding mechanism |23 comprises a support |2l| positioned. in spaced relation above .the rock arms ||3 and |26. This support is movable as a unit with the die assembly1-31 and is supported on the member 6| of the top die section 45 by laterally spaced. vertical rods |25, shown best in Figure 'i of the drawings." .Mounted on the support is a plate |2'fhavin`g openings |21 therethrough for respectively` receiving two continuous lengths of rivetstock |28'. As shown'lparticularly in Figure 19 the innerwalls of the openings |22 taper outwardly from' the top surface of the plate |25 and Aaclutch |29 is supported in each opening. Each clutch comprises a plurality of sections cooperating with one another to form a centralpassage for receiving length of rivet `stock`|28 and'fhaving the outer wallstapered to conform to the inner walls of the opening |21. A roller |3|is rotatably lSupported in .each clutehsection and the, rollers are` lgrooved to frictionally engagefthe lrivet stock |28 passing through the clutches |29. vTheI'Jeripheralportions of the rollersalso ,ride "on the tapered inner walls of the openings |21v and the arrangement is such that ,when the clutches are'` in their upper- ;nost position with respect to the ,plates |26, the rivet stools |23 isgrippedfby therollers. The clutch sectionsarenrged to theirv stockgripping positions by coil springs |32 `having` the lower seatedonbrackets |33, and having the upper ends respectively rvengaging the 4sections of the two clutches. Thebrackets |33 aresuitablysvpported on the plate |26. below the latter andere formed. with clearance, openings -for the rivet stock.

It follows `from the foregoing fthat the two lengths of rivet stock |28 are frictionally gripped by the clutches |29. However, the nature of the clutches is such that the `two lengths of rivet stock |23 may be. pulled ,downwardly relative to the clutches. In orderv to ygri'p the ,two lengths of rivet. stock for feeding ,thesame in a downward direction, a second Vplate |34 is positioned directly below the plate |26. Referring again to Fig- 19 of the drawings, itwillbe noted that the plate i2@ is centrallyfapertured tofreely receive a bolt |535 havinga headattheilower end and having athreaded shank extending upwardly through the support. andplate ,|2l5.v .The threaded shank projects freely through the plate |26 and is threaded in the support |24, so that` the plate i2@ may be clamped tothe Support by nuts |35 threaded on theupper endlof the bolt. It `vill also be noted that the platel |34 is normally urged downwardly relative to the plate |25 by coil springs |31 interposed between the plates.

The plate |34 is formed with openings |28 respectively aligned with the openings |21 in the plate |26 and having the side walls tapered in the same direction asV the walls of the openings fll. Identical clutches |39 are respectively'supported in the openings |38 yand the rollers |23 of the clutches |39A are4 normally urged` into gripping relationshipwith the. rivet` stock by the springs lill which are identicaltothe springs itt.

In order to feed the twolengths of rivet stock in a downward direction the .plate ,|311 is moved upwardly against the action offthe springs |31. @wing to the nature of the clutches |39',` upward movement of the. plate s |34 releases .'thelclutches permitting relatively free upwardmovement of the plate |34. Althoughfthis upward ,movement of the plate |34 may'impart an't upward thrust vsecured to the plates it?. secured togetherv by studs it@ which project by suitable grooved'rollers |52.

on the two lengths vof 'rivet stock, nevertheless,

the clutches |29 prevent upward displacement of the rivetstock'.` As soon as the upward movement ofthe plate i3d is discontinued, the clutches |39 firmlygrip the two lengths of stock so that the latter are advanced 4during downward movement of 'the plate |34by' the springs iiili. It will be understood frointhe above that as soon as a downwardpull is applied to the two lengths of vrivetstock by the lclutches |39, the clutches |29 release the stock so" as not to interfere with feeding of the latter'.

in'thepresent instance the plate |3615 is 'moved in an upward direction to initiate the rivet stock feeding action' by the rock arms |26. As shown in ltigures'i and 14 of the drawings, a rail |432 extends between the plates i3d and the bridge i2! connecting the rear ends of the rock arms The rear end of the rail |l|2 is pivoted for vertical swinging movement to the upper end of a vertical support' M3 having the lower end securedto a suitable frame part iti-i. The arrangement is such that as the rock arms ||3 and i2@ are operated by the cams 93 to assist in moving the topdie section i5 downwardly, the bridge itl on the rock arms i2@ engages the rail Nit to swing the latter in an upward direction. As the free end of the 'rail |152 swings upwardly, it engagesthe plate i3d and displaces the latter in an upward'direction against the springs isi to as straight as possible in order to assure properly feeding the rivet stock into the die assembly. For accomplishing this result rivet stock straightening mechanism |65 is provided. This mechanismhas a vslide |45 suitably supported above the rivet stock feeding mechanism |23 for vertical sliding movement. As shown in Figures 13,V Zorand 21l the slide lli@ comprises laterally spaced plates iti and vertical columns |28 located between the plates. The columns it are channel-shaped in cross section and are revcrsely positioned with respect to one another in the manner Ashown in Figure 20 of the drawings. These columns are 'suitably supported at the lower ends on the machine frame and act as a guidev for the slide Mit. A pair of shoes it@ are respectively slidably supported in the channelshapedv columns and these shoes are respectively The plates lili are through vertically elongated slots |5| formed in the base portions of the channels.

The two lengths of rivet stock its are guided from suitable coils of stock (not shown) along opposite sides of the straightening mechanism The stock is 'then passed downwardly at opposite sides of the slide it@ in operative relation to straightening rollers |53. The straightening rollers ld are arranged in two sets'respectively rotatably supported on opposite sides of `the slide ilil. Each set of straightening rollers |53 comprises three rollers |56, I and'lS -spaced from each other in the 1 1 direction of movement of the slide. A length of rivet stock is passed over the front side of the rollers |54 and over the rear side oi the intermediate roller |55 to the front side of the roller |56. It will be noted from Figure 13 of the drawings that the intermediate roller |55 of each set is positioned to lie between the rollers |53 and |56, so that the rivet stock is reversely bent to some extent as it passes over the rollers and is stretched sufciently to straighten the same. It will be noted that the rollers |54 and |55 are rotatably supported on eccentrics |54 (Figure 20) to enable adjusting the extent of bending of the rivet stock engaged by the straightening rollers.

In order to assure eiectively straightening the two lengths of rivet stock |28 the slide |46 is actually moved upwardly some time prior to feeding the lengths of stock |28 to the die assembly 31. In order to move the slide |46 in an upward direction at the desired intervals, a cam |58 is secured to the shaft 42 and is engageable with the lower end of an arm |59 shown in Figure 13 of the drawings as slidably supported on an arm |68 carried by one of the columns |48. The upper end of the arm |59 has an ear 6|, and the lower end of a link |62 is pvoted to the ear |6| by a pin |63. The upper end of the link |62 is pivoted to the slide by a pin |64, so that upward displacement of the arm |59 by the cam |58 imparts a corresponding upward movement of the straightening device |45. Return or downward movement of the slide is effected by a spring |65 having the lower end connected to the arm |68 and having the upper end connected to the slide |46. Attention is called to the fact at this time that the lower end of the arm |60 is supported on a part of the machine frame in the manner clearly shown in Figure 22 of the drawings.

By reason of the straightening device |45 defined above, the portions of the rivet stock |28 between the die assembly 31 and the feeding mechanism |23 are maintained perfectly straight within practical limits. As a consequence jamming of the die assembly by irregular rivet stock is reduced to a minimum.

The feeding mechanism |23 is so arranged with respect to the die assembly 31 that the two lengths of rivet stock are located respectively adjacent opposite longitudinal edges of the structural element 38, and as shown in Figure 2 of the drawings, are spaced from each other longitudinally of the structural element. Actually the length of rivet stock |28 at one side of the structural element is adapted to register with the row of embossed portions 33 at the same side of the structural element, and the other length of rivet stock is adapted to register with the row of embossed portions 33 at the opposite side of the structural element.

As shown particularly in Figure 7 of the drawings the lower end of each length of rivet stock |28 extends downwardly through aligned openings |61 and |68 formed in the member 6| and slide 58 of the top die section 45. A bushing |66 is secured in each opening |61 and the bore through the bushing is aligned with the adjacent opening |68 in the slide 56 when the latter is in its forwardmost or inoperative position. It will be understood that the bore through each bushing |69 and the associated opening |88 are of a diameter approximating the external diameter of the rivet stock so as to snugly engage the same.

The lower ends of the two lengths of rivet stock |28 accommodated in the openings |68 are severed from the remainder of the stock by moving the slide 58 in a rearward direction against the action of the spring 64. The slide 58 is moved in a rearward direction against the action of the spring 64 to shear the lower ends of the rivet stock from the remainder thereof by cams |10 shown in Figures 5, 6 and 9 of the drawings. It will be noted from Figure 5 of the drawings that the cams |19 are secured to the shaft 94 in positions to respectively engage the cam ends 1| of the cross piece 68. The arrangement is such that the cams |16 engage the cross piece 68 at about the same time the cams 93 engage the top plate 81 on the header assembly to move the top die section 45 downwardly. In any case engagement of the cam |10 with the cross piece 68 moves the slide 58 in a rearward direction against the action of the spring 64 to cut off the lower end portions of the rivet stock |28 to form pins or rivets 35.

By the time the slide 58 approaches the end of its rearwardmost travel, the top die section 45 has been moved downwardly and the bottom die section 46 has been moved upwardly to cooperate with the top section in embossing the strips 3|, 32 of the structural element 30. Referring again to Figures 6 and 9, it will be noted that when the top die section 45 is in its lowermost position, the cam ends 1| on the cross piece 66 assume positions at the rear ends of a pair of stops |13. As shown in Figure 5 of the drawings the stops |13 are respectively secured to the shoes 55 and 56. The purpose of the stops is 'tc prevent immediate return movement of the slide 58 by the action of the spring 64 after the cross piece 68 is released by the cams |10. Actually the stops |13 cooperate with the end portions 1| of the cross piece to retain the slide 58 in its rearwardmost position until the top die section 45 is returned to its uppermost position shown in Figure 6 of the drawings.

It has previously been stated that during the embossing operation the die assembly 31 is advanced as a unit with the structural element 30. This is accomplished by the cam 44 previously described as secured to the shaft 42. The cam 46' engages the front end of a plunger |14 shown in Figure 6 of the drawings as slidably supported in the frame structure |44. The plunger is yieldably urged into contact with the cam 44 by a coil spring |15 supported between the rear end of the plunger and the bridge member 89 at the iront end of the die assembly. The cam 44 is designed to impart rearward movement to the die assembly 31 at about the same time the die sections 45 and 46 are relatively moved toward each other into engagement with the structural element 60.

The rivets or pins 35 sheared from the lower ends of the stock |28 by the slide 58 are retained in the openings |88 of the slide and when the slide is in its rearwardmost position, the pins 35 register with aligned openings |11 and openings |18 in the plates 51 and parts 52 respectively. It will further be noted from Figure 7 of the drawings that the member 6| of the top die section 45 is formed with openings |19 aligned with the openings |11, The openings |19 are adapted to respectively receive punches extending downwardly from the plate 81 of the header assembly 86. The purpose of the punches |80 is to engage the upper ends of the pins 35 upon continued downward movement of the header assembly and to force the pins through the strips 3|, 32 of f tion.

punching operation, it will be understood that the cooperating die sections 45 and 4B are in their relative closed positions wherein the'slide is held by the stops |13 in its rearwardmost posi- However, as soon as thefpins 35 are eX- ten'ded into the strips 31, 32by the punches |811, thecooperating die sections are opened,'permit 'ting the slides@ to return to its forwardmost position by the action ofthe spring 64. `It may be pointed out at this time that vertical travel of the top die section 'd5 is accurately guided by pins |83 extending downwardly from the header plate '81 at longitudinally spaced points and adapted to respectively slide in bores|84 formed 'in the member E1. If desired the pins |83 may also be extended through the slide 53 and the piate '51 when the slide'is in its rearwardmost position, in order toinsure--aligning the openings 168 with the lower ends of the punches |813. For this purpose the slide 58 isV formedv with openings ltlocated to 'respectively register with the bores 181i in the rearwardmost position of the slide. These pins project through the slide vil at about the-saine time the punches |80 are'ope'rative'to perform the punching operations' and'theplates i'are formed with openings |36 in alignment with the openings 184 toreceive the lower ends of the guide pins 183.

After the punching operation'and subsequent to'separation of the die sections, the die assembly 31 is returned to its forwardmost position.

AThis is accomplished by a cam |81 similar to the cam #i4 previously described. As shown in Figures l and 3 of the drawings the cam |81 is secured to a drive shaft |88 located beyond the rear end of the die assembly 31 and journalled in suitable bearings |39 on the machine frame. This construction is also shown in Figure'16 ot the drawings, wherein it will be noted that a gear |1911 is secured to the shaft |88 land meshes with 'a gear 19| which is secured to a shaft |92 jour- Inalled in the bearings 189 -below the shaft 188. 'It will also be noted that Ya drive gear |93 is secured to the shaft |92 and this gear is operatively connected to the drive shaft 99 through gearing 19d, shown in Figure 1 of the drawings.

The cam 181 is engageable with the outer end of a plunger 195 supported intermediatethe ends in a part 196 of the machine frame for sliding movement. The rear end of the plunger |95 is yieldably urged into engagement with the cam 1 31 by a spring |91 located between the front Vend Aoi the plunger and the bridge 89 at the rear 'end of the header assemblyV 86.

The cam |81 operates in out-of-phase relationship to the cam d4 and serves to return the die assembly 31 to its forwardmost position subsequent to the punchdetailA a vlinlr11i9 is pivotedy at the'rear end to a `Aiixedsupportiii);l andI -is provided-witha cam follower 213| intermediate the ends for 'engagement with the earn |98. The front end ofthelink |99 is pivotally connected to the rear end of a second link E82 by a link 2%. The rear end of the link is shown in Figure 14 of the drawings as pivoted to a bracket 2M, which in turn, is connected to a cross piece 295 extending between the rear swinging ends of the rock arms |29. A fulcrum in the form of a roller 2% is supported on the header assembly for engagement with the link 2oz intermediate the ends thereof. The cam |53 operates in timed relation to the cam 93 to swing the rear ends of the rock arms-12E downwardly and thereby assist in moving the rollers 161 downwardly against the rear end of the top die section 55.

As the structural element it is advanced rearwardly beyond the die assembly 31, the pins or rivets 35 are peened and riveted over vthe respective strips 3|, t2. Referring `again to lFigures 1 and 16 it will be noted that a 'pair of roll sections 2i1 are secured to the shaft E33 at opposite sides oi the cam |81 impositions to engage the upper ends or" the pin 35. It will further be noted that a roll 21l8 is secured to the shaft 192 directly opposite theroll sectionsI and is provided with annular portions Zot adjacent opposite ends whichcoop'erate with the roll sections to form serrations'in the opposite ends oi the pins 35 in the manner shown in Figures 25 and 26 of the drawings. As the structural element continues to advance the serrated ends of the pins 35 are 'peened' over in the manner shown in Figure `21 of the drawings "by oooperating rolls 2 lil. These' rolls are respectively mounted on shafts in positions aboveand below the structural elementjand 'are driven by suitable gearing 211 shown in Figure 1 of the drawings.

As advancement of the structural `element continues further, the opposite'ends 'of the pins S5 are actually riveted over the adjacent strips 31 and 32 by a pair of riveting'rolls 212. The rolls 212 are formed with a plurality of circumierentially spaced riveting `heads 213. The riveting heads 213 project beyond the peripheral portions o1 the rolls 212 and are arranged in two series spaced axially from-eachother a distance determined so that one series Vengages the pins t5 at one side oi the structural element and the other series `engages the pins at the opposite side oi the structural elementi-iii.

The riveting rolls 212 are driven independently of the remaining rolls and are indexed in timed relation to the rate of travel of 'the structural element in order to accurately register with the extremities of the pins The indexing mechanism is shown in detail by Figures 1'1 and 1S of the drawings. This indexing `mechanism comprises a ratchet wheel 255 keyed vor otherwise secured to the drive shaft 92 and a second ratchet wheel 21e connected to the shaft 2H on which the riveting rolls 212 are supported. The ratchet wheels are connected by a slide bar 21S supported in any suitable manner for sliding movement on a part 219 ofthemachine frame. A wear plate 22S is secured to the end of the bar '.218 adjacent the ratchet wheel 215 for successive engagement'by the teeth on the wheel 215. A pawl 22| is pivoted to the opposite end of the bar 218 in a'position to engage the teeth on the ratchet wheel Zit. A coil spring 2212 is provided for normally urging the bar 21S in a direction toward the'ratchet wheel 215. -Thus the end vof the-bar 2111 "adjacent 

